Brand new drive belt is released together with TA05-IFS R Chassis Kit and that can utilized as an extra belt because of its drive train (37T-18T-37T pulleys). It can also be used with TA05 series drive train (36T- 16T-36T pulleys) if changes suggested into the TA05-IFS R instruction manual are followed and when ITEM 53988 Ball Differential Pulley (37T) and either ITEM 53989 Center Pulley (18T) or ITEM 54050 TA05-IFS R 18T Center One-Way are installed.